Met this girl m who I am looking to go on a 1st date with, however they have gone on holiday for 1 1/2 weeks so we agreed to go when she's back.

How do I A) keep her interested and B) re-enforce it while they are away without being clingy?

Do you just let them go and not try and contact them and hope they remember when back in the country? Or send 1-2 subtle messages?